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What are the advantages of static factory methods?
The advantages of static factory methods is that:
- unlike constructors, they have names.
- unlike constructors, they are not required to create a new object each time they’re invoked.
- unlike constructors, they can return an object of any subtype of their return type.
What is Factory & instance methods?
A Factory Pattern or Factory Method Pattern says that just define an interface or abstract class for creating an object but let the subclasses decide which class to instantiate. In other words, subclasses are responsible to create the instance of the class.
What is singleton Factory method?
Singleton – Ensures that at most only one instance of an object exists throughout application. Factory Method – Creates objects of several related classes without specifying the exact object to be created.
When to make a method static?
The only time you want to use a static method in a class is when a given method does not require an instance of a class to be created. This could be when trying to return a shared data source (eg a Singleton) or performing an operation that doesn’t modify the internal state of the object (String.format for example).
What is the use of a static method?
The static keyword is used to create methods that will exist independently of any instances created for the class . Static methods do not use any instance variables of any object of the class they are defined in. Static methods take all the data from parameters and compute something from those parameters, with no reference to variables.
What does it mean for a method to be “static”?
static means that the method is associated with the class, not a specific instance (object) of that class. This means that you can call a static method without creating an object of the class. void means that the method has no return value.
What are the restrictions for static method?
The static method cannot use non-static data member or invoke non-static method directly.